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Permanently hardening or solidifying on being heated. Used of certain synthetic resins.
(Chemistry) (of a material, esp a synthetic plastic or resin) hardening permanently after one application of heat and pressure. Thermosetting plastics, such as phenol-formaldehyde, cannot be remoulded. Compare thermoplastic
ther•mo•set•ting(ˈθɜr moʊˌsɛt ɪŋ)
pertaining to a type of plastic, as one of the urea resins, that sets when heated and cannot be remolded.
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|Adj.||1.||thermosetting - having the property of becoming permanently hard and rigid when heated or cured; "the phenol resins and plastics were the original synthetic thermosetting materials"|
thermoplastic - having the property of softening or fusing when heated and of hardening and becoming rigid again when cooled; "thermoplastic materials can be remelted and cooled time after time without undergoing any appreciable chemical change"